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imx233/fuze+: implement lradc function and adc on top of it

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30534 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Amaury Pouly 2011-09-13 23:40:09 +00:00
parent 45537a4e87
commit 696b9d146b
6 changed files with 446 additions and 2 deletions
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146
firmware/target/arm/imx233/lradc-imx233.c Normal file
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2011 by Amaury Pouly
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "system.h"
#include "system-target.h"
#include "lradc-imx233.h"
static struct semaphore free_bm_sema;
static struct mutex free_bm_mutex;
static unsigned free_bm;
void imx233_lradc_setup_channel(int channel, bool div2, bool acc, int nr_samples, int src)
{
__REG_CLR(HW_LRADC_CHx(channel)) =HW_LRADC_CHx__NUM_SAMPLES_BM | HW_LRADC_CHx__ACCUMULATE;
__REG_SET(HW_LRADC_CHx(channel)) = nr_samples << HW_LRADC_CHx__NUM_SAMPLES_BP |
acc << HW_LRADC_CHx__ACCUMULATE;
if(div2)
__REG_SET(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__DIVIDE_BY_TWO(channel);
else
__REG_CLR(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__DIVIDE_BY_TWO(channel);
__REG_CLR(HW_LRADC_CTRL4) = HW_LRADC_CTRL4__LRADCxSELECT_BM(channel);
__REG_SET(HW_LRADC_CTRL4) = src << HW_LRADC_CTRL4__LRADCxSELECT_BP(channel);
}
void imx233_lradc_setup_delay(int dchan, int trigger_lradc, int trigger_delays,
int loop_count, int delay)
{
HW_LRADC_DELAYx(dchan) =
trigger_lradc << HW_LRADC_DELAYx__TRIGGER_LRADCS_BP |
trigger_delays << HW_LRADC_DELAYx__TRIGGER_DELAYS_BP |
loop_count << HW_LRADC_DELAYx__LOOP_COUNT_BP |
delay << HW_LRADC_DELAYx__DELAY_BP;
}
void imx233_lradc_kick_channel(int channel)
{
__REG_CLR(HW_LRADC_CTRL1) = HW_LRADC_CTRL1__LRADCx_IRQ(channel);
__REG_SET(HW_LRADC_CTRL0) = HW_LRADC_CTRL0__SCHEDULE(channel);
}
void imx233_lradc_kick_delay(int dchan)
{
__REG_SET(HW_LRADC_DELAYx(dchan)) = HW_LRADC_DELAYx__KICK;
}
void imx233_lradc_wait_channel(int channel)
{
/* wait for completion */
while(!(HW_LRADC_CTRL1 & HW_LRADC_CTRL1__LRADCx_IRQ(channel)))
yield();
}
int imx233_lradc_read_channel(int channel)
{
return __XTRACT_EX(HW_LRADC_CHx(channel), HW_LRADC_CHx__VALUE);
}
void imx233_lradc_clear_channel(int channel)
{
__REG_CLR(HW_LRADC_CHx(channel)) = HW_LRADC_CHx__VALUE_BM;
}
int imx233_lradc_acquire_channel(int timeout)
{
int w = semaphore_wait(&free_bm_sema, timeout);
if(w == OBJ_WAIT_TIMEDOUT)
return w;
mutex_lock(&free_bm_mutex);
int chan = find_first_set_bit(free_bm);
if(chan >= HW_LRADC_NUM_CHANNELS)
panicf("imx233_lradc_acquire_channel cannot find a free channel !");
free_bm &= ~(1 << chan);
mutex_unlock(&free_bm_mutex);
return chan;
}
void imx233_lradc_release_channel(int chan)
{
mutex_lock(&free_bm_mutex);
free_bm |= 1 << chan;
mutex_unlock(&free_bm_mutex);
semaphore_release(&free_bm_sema);
}
void imx233_lradc_reserve_channel(int channel)
{
semaphore_wait(&free_bm_sema, TIMEOUT_NOBLOCK);
mutex_lock(&free_bm_mutex);
free_bm &= ~(1 << channel);
mutex_unlock(&free_bm_mutex);
}
int imx233_lradc_sense_die_temperature(int nmos_chan, int pmos_chan)
{
// mux sensors
__REG_CLR(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMPSENSE_PWD;
imx233_lradc_clear_channel(nmos_chan);
imx233_lradc_clear_channel(pmos_chan);
// schedule both channels
imx233_lradc_kick_channel(nmos_chan);
imx233_lradc_kick_channel(pmos_chan);
// wait completion
imx233_lradc_wait_channel(nmos_chan);
imx233_lradc_wait_channel(pmos_chan);
// mux sensors
__REG_SET(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMPSENSE_PWD;
// do the computation
int diff = imx233_lradc_read_channel(nmos_chan) - imx233_lradc_read_channel(pmos_chan);
// return diff * 1.012 / 4
return (diff * 1012) / 4000;
}
void imx233_lradc_init(void)
{
mutex_init(&free_bm_mutex);
semaphore_init(&free_bm_sema, HW_LRADC_NUM_CHANNELS, HW_LRADC_NUM_CHANNELS);
free_bm = (1 << HW_LRADC_NUM_CHANNELS) - 1;
// enable block
imx233_reset_block(&HW_LRADC_CTRL0);
// disable ground ref
__REG_CLR(HW_LRADC_CTRL0) = HW_LRADC_CTRL0__ONCHIP_GROUNDREF;
// disable temperature sensors
__REG_CLR(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMP_SENSOR_IENABLE0 |
HW_LRADC_CTRL2__TEMP_SENSOR_IENABLE1;
__REG_SET(HW_LRADC_CTRL2) = HW_LRADC_CTRL2__TEMPSENSE_PWD;
// set frequency
__REG_CLR(HW_LRADC_CTRL3) = HW_LRADC_CTRL3__CYCLE_TIME_BM;
__REG_SET(HW_LRADC_CTRL3) = HW_LRADC_CTRL3__CYCLE_TIME__6MHz;
}